Type about:config in the browser's address bar.To enable or disable multi-process Firefox, do the following An alternative is to disable all add-ons, enable e10s, and enable extensions one by one to find out whether they are compatible. What you can do, is create a secondary profile in Firefox, copy all extensions of the first profile to it, and enable e10s for that secondary profile. The majority of Firefox add-ons are not tested though so that you may be none the wiser after checking your add-ons on the site. You may check out the Are We e10S Yet site which lists top add-ons and their compatibility with e10s. While you can jump into water right away by enabling Electrolysis without verifying compatibility first, it is highly suggested to verify that all important add-ons are compatible with e10s before you do so. If you don't run add-ons, about 40% of Firefox users don't according to Mozilla, you may skip the step. Before you do so, you may want to run compatibility checks for add-ons though.
